Therefore, in order to facilitate understanding the drawings and the surface features expressed in a map, it is necessary for map data to do symbolization processing.

因此，为了方便读图和了解图内所表示的地物目标，常常要进行地图数据的符号化处理。

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Therefore, in order to facilitate understanding the drawings and the surface features expressed in a map, it is necessary for map data to do symbolization processing.

因此，为了方便读图和了解图内所表示的地物目标，常常要进行地图数据的符号化处理。

youdao